Improvement in devices for converting motion



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IMPROVEMENT IN DEVICES FOR CONVERTING MOTION.

Specification forming part of Letters Patent No. h5 7,946, dated December 22, 1874; application filed October 1, 1874.

To all whom it may concern:

Be it known that we, J osrAH TIsDALE and HORATIO N. ALLEN, ofNorwood, of the county of Norfolk and State of Massachusetts, have invented a new and useful Improvement in Mechanism for Revolving a Shaft; and do hereby declare the same to be fully described in the following speciiication, and represented in the accompanying drawings, of which- Figure l is a front elevation; Fig. 2, a side view; Fig. 3, a transverse section; and Fig. 4, a horizontal section taken along the axis of thel main shaft. Fig. 5 is an inner side view of one of the grooved wheels or pulleys with its operative ring or brake. Fig. 6 is an inner side view of such ring with its spring, which in Fig. 5 is shown in dotted lines.

Our present invention has special reference to the treadle mechanism described in the United States Patent No. 143,543; and consists in a new construction of each of the brakes coupled with a special arrangement of its operative spring; also, in a new mechanism for effecting the tightening of the belts; also, to a new construction of the crank-arm, by which it may be more readily adapted to driving-cranks of mechanism; also, in the reciprocating frame, as provided with iianges arranged with bands and driving-pulleys, so as to prevent contact of the bands, and thence from chafing or wearing each other.

In the said drawings, A denotes an-arbor or shaft, formed as shown, and having arranged upon it concentrically a short tubular shaft, B, provided with a crank-arm, C, and a brake wheel, D. This latter has circular lian ges a a projecting from its opposite sides and around it circumerentially, each of such anges being to operate with the two studs or prongs of one of two rings, E E, which are arranged concentrically with the shaft of the brake-wheel and in chambers b b of two grooved wheels or pulleys, F Ff, arranged on the shaft B. Each ring E is pivoted at one part of it to its wheel F or F', and opposite to such pivot-that is, the ringhas anotch, c, to loosely span a stud, d, projecting from the wheel. The ring or brake on its inner side is hollow, as shown at c, and there provided with a spring, f, attached at one end to the ring, and at the other to the wheel,

all being as represented. The spring is eifectually covered by the brake, and is, therefore, not liable to be displaced. The jaws or studs g g ofthe ring, arranged as shown, span one of the iianges of the brale-wheel D-that is, the ange enters between such jaws, one being ,in .its outer and the other in its inner periphery. The two chambered wheels F F turn freely on their supportingshaft, and carry around with them the brake-rings, so as to cause them to alternately gripe and revolve the brake-wheel and its shaft, the latter being to turn freely on the supporting-shaft A. There is fixed to the groo ved periphery of each of the brake-wheels one of three round belts, G G1 G2. The belt G xed at one end to one of the wheels, and at the other end to the other of said wheels, is arranged in a frame, H, formed very much like the flier of a spinningframe. The belt at and about its middle goes over the top or arch of the frame, and through holes in the Hanks ofthe arch, and thence down along the inner surface of the frame, and alongside of anges h h arranged in the frame, and projecting therefrom, as shown. The belt winds around each of the grooved wheels, it going around one in one and the other in the opposite direction. The other belts G1 GZ, also attached to the grooved wheels, respectively, wind about them in directions opposite to those in which the belt G does, and. their belts Gl G2 enter slide-nuts I I arranged in the frame H in manner as shown. Screws K K extend up through the frame, and screw into the nuts and also into the belts G1 G2, and thus connect the said belt with the frame, and enable them to be taken up or tightened upon the pulleys, as occasion may require. The

j crank-arm C we construct in two main parts,

m n, as shown, one of them, m, being projected from and fastened to the shaft B, and the other, n, being pivoted at its inner end to the other. A screw, o, going through the part m near its outer end, and, bein g screwed through the part n, serves to draw the latter part toward the other, in order to effect the clamping of the arm to a pulley or device to be driven by the mechanism. The flanges k h of the frame H serve to separate the belts, so as to prevent them from chatng or wearing each other.

If the arbor A be supposed to be stationary, and to the frame H there be imparted a reciprocatin g rectilinear motion in the direction of its length, all of which maybe accomplished by a pedal or treadle, a revolution in one direction will be imparted to the brake-wheel D, each brake-ring acting and griping the said Wheel successively, so as to canse it to revolve and turn its shaft B on the arbor A, the arm C being revolved with the shaft B. The grooved Wheels F ll" during the movements of the frame H Will be simnltaneoushT revolved, so as to cause the brake-rings to turn the brake-wheel constantly in one direction.

From the above it will be seen that the described mechanism, like that explained in the said United States Patent No. 143,543, can be used to operate a sewing-machine.

What we claim as our present inventionpin such mechanism may be stated as follows:

1. The hollow or chambered ring-brake E and the operative spring f arranged Within it, as set forth.

2. The band G1, and its tightening-screw K arranged Within the nut I, and with the screw screwed into such nut and the band, all being substantially as shown and described.

3. The crank-arm (l, as composed of the parts m and n, pivoted together and provided With the connection and clamp-screw o, all as specified.

4. The frame H, provided With'the llanges h h arranged in it, and -With the driving-pulleys and belts, as explained and represented. v

l JOSIAH TISDALE.

. HORATIO N. ALLEN. Witnesses:

R. H. EDDY,

J. R. SNOW. 

